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    <p>There are two JavaSpaces implementations of any note: <a href="http://www.dancres.org/blitz/" rel="nofollow">Blitz</a> and <a href="http://gigaspaces.com" rel="nofollow">GigaSpaces XAP</a>. Blitz is open source; XAP is commercial, but has a community edition that's free for use.</p> <p>I'm heavily biased towards XAP; I work for them. :) That said, there are a lot of reasons to consider XAP:</p> <h2>Space Aquisition</h2> <p>The mechanism for acquiring a space reference is <strong>far</strong> easier with GigaSpaces than it is with default JINI:</p> <p>UrlSpaceConfigurer urlSpaceConfigurer = new UrlSpaceConfigurer("/./space"); IJSpace space = urlSpaceConfigurer.space(); // space is a close JavaSpaces analog, extended because the specification is rather limited</p> <p>GigaSpace gigaSpace=new GigaSpaceConfigurer(space).gigaSpace();</p> <p>// gigaSpace has <strong>many</strong> API improvements and is far more flexible.</p> <h2>API Improvements</h2> <p>The default JavaSpace API has no compensation for multiple tuple matches in the space. The more recent (i.e., 8 years old?) does, and Blitz implements it, but it's still not very flexible. Plus, you still get stuck with JINI Entries, which follow something like these rules:</p> <ol> <li>Every field must be public. (i.e., "public String foo")</li> <li>Every type must extend Entry.</li> <li>Every field must extend Object. (i.e., Long instead of long, etc.)</li> </ol> <p>XAP allows you to use Entry, but doesn't require it; with XAP, you can use ordinary POJOs. You still want to prefer Object types, because of wildcards (null is the JavaSpaces wildcard) but that's up to you.</p> <p>XAP also provides a SQL query mechanism, as well as a document-based model (schemaless) for entries, and can also use Spring to manage notifications and remoting.</p>
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    1. POWhere to start with JavaSpaces?
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    1. USJoseph Ottinger
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    1. COWhat are limitations of XAP cummunity edition?
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      1. USИван Бишевац
    2. COYou can use the entire feature set of the application platform except for clustering, and support is community-based rather than official.
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      1. USJoseph Ottinger
 

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